Olive tree (Olea europaea L.) response to the application of biostimulants | Respuesta del olivo (Olea europaea L.) a la aplicación de nuevos productos bioestimulantes
2006
Molina Soria, C.
The possible effects of four foliar-applied biostimulants on olive trees, before coming into the market, were studied. Two experiments were carried out in the greenhouse using young plants and also under field conditions using mature trees. In the greenhouse experiment, mist-rooted "Picual" olive culttings were transferred to 2.5 plastic plots containing a mixture of river sand and peat. To obtain plants with a low nutritional level, they were watered twice a week with 250 ml of water. After the growing period, plants were arranged in a randomized factorial experiment. One factor was the biostimulants and another was the concentration. There were eight replications. Three foliar weekly intervals and, when it finished, nutrient concentration was determined in roots, shoots and leaves. Field experiment was carried out in 80-year-old "Hojiblanca" olive trees. These olive trees were selected because of their low potassium level. A randomized block design was used with two treatments and four blocks. Two foliar applications were realized, one fifteen days before blossom and another, fifteen days after blossom. The effects of treatments on vegetative growth, nutritional olive tree status and yield were evaluated. There was not effect of foliar biostimulant applications on vegetative growth of young plants, although nutrient concentration was affected. It probably was due to the fact that nitrogen values were below the threshold limit. There were not effects of the treatments on vegetative growth, nutritional olive trees status or yield. It is reasonable because olive trees showed an adequate nutritional status and it was the first year of experiments
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